The Clarion was a weekly newspaper published by Robert Blatchford, based in the United Kingdom. It was a socialist publication with a Britain-focused rather than internationalist perspective on political affairs, as seen in its support of the British involvement in the Anglo-Boer Wars and the First World War.

Robert Peel Glanville Blatchford was an English socialist campaigner, journalist, and author in the United Kingdom. He was also noted as a prominent atheist, nationalist and opponent of eugenics. In the early 1920s, after the death of his wife, he turned towards spiritualism.